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Polyimide-Insulated T2 Thermocouple Wire (Ni95-(Al+Mn+Si)5)
Available Configurations
Properties common to all products in this list
| Conductor Diameter | Insulation Thickness | Length |
|---|---|---|
| 0.05 mm to 0.25 mm | 0.003 mm to 0.04 mm | 0.1 m to 10,000 m |
Need custom configurations? Please contact us.
Health hazard/Hazardous to the ozone layer
Serious health hazard
Certified Thermocouple Pairs
For applications where the pairing itself needs to be verified, not just each leg individually, certified thermocouple pairs are available through our premium manufacturing network with decades of dedicated production experience and in-house, accredited calibration laboratory.
| Capability | Details |
|---|---|
| Thermocouple types available | S, R, B only (platinum and platinum-rhodium alloys) |
| Pair matching | Precision-matched from the same calibrated production batch |
| Manufacturing standards | Platinum refined in-house to 99.995% purity; Rhodium to 99.98%. Wire diameters from 0.04mm to 1.6mm. Every batch pre-annealed and calibrated before shipping. |
| Testing & calibration | Fixed-point method (zinc, aluminium, gold, palladium reference points). EMF evaluated against EN 60584-1 and ASTM E230/E230M tolerance classes. ISO/IEC 17025-accredited laboratory. |
| Certification | Supplied with calibration certificate. ISO 9001 & ISO 14001 certified manufacturing. |
| Typical use | Calibration, high-accuracy, or traceability-critical applications |
Want to learn more? Explore our complete thermocouple range, covering both our standard and custom offerings.
Key Features
Polyimide-Insulated T2 Thermocouple Wire (Ni95/Al-Mn-Si) is the Alumel negative thermoelectric leg of the Type K thermocouple pair, supplied with a polyimide film insulation that provides superior thermal stability, chemical resistance, and dielectric integrity compared to polyester or polyurethane alternatives:
Negative leg for Type K across the full cryogenic to high-temperature range
Alumel (Ni95/Al-Mn-Si) is the negative leg of Type K. The combination of Alumel alloy and polyimide insulation supports use from cryogenic conditions to elevated temperatures, covering the full Type K operating span.
Polyimide insulation for cryogenic to elevated-temperature applications
Polyimide maintains insulation integrity and dimensional stability from cryogenic temperatures through to elevated service temperatures, making this wire suited to aerospace environmental chambers, freeze-drying and lyophilization systems, and high-temperature calibration apparatus where insulation integrity must be maintained across the full operating range.
Superior performance over polyester and polyurethane alternatives
The polyimide film provides higher thermal stability, better chemical resistance, and superior dielectric integrity at elevated temperatures compared to polyester or polyurethane insulation, making this wire the correct choice when the insulation rather than the conductor performance is the limiting factor.
Type K widest base-metal thermocouple range
Type K covers -200°C to 1260°C, the widest range of the standard base-metal thermocouple types. T2 is the matching complement to T1 (Chromel) in any K-type assembly, and this polyimide-insulated form is selected where the full range operation in demanding environments requires insulation stability that standard organic coatings cannot provide.
Wide conductor diameter range for diverse assembly formats
Conductor diameter from 0.05 mm to 0.25 mm supports a range of probe and sensor assembly formats for aerospace, environmental chamber, and process equipment instrumentation.
Industrial Applications
Polyimide-Insulated T2 Thermocouple Wire is used for Type K thermocouple fabrication in aerospace, cryogenic, and elevated-temperature applications where insulation integrity across the full operating range is required:
- ✦ Aerospace test environment and environmental chamber instrumentation
- Used for Type K thermocouple fabrication in aerospace test environments and environmental chambers spanning cryogenic to elevated temperatures, where the polyimide insulation maintains dielectric integrity and dimensional stability across the full measurement range.
- ✦ Freeze-drying and lyophilization temperature monitoring
- Applied in temperature measurement assemblies for freeze-drying and lyophilization systems where operation from cryogenic temperatures through to elevated processing temperatures requires insulation performance that polyester alternatives cannot maintain at the low-temperature extreme.
- ✦ High-temperature calibration apparatus
- Used in high-temperature calibration apparatus where thermocouple lead insulation must maintain integrity at elevated temperatures and the full Type K range must be accessible without insulation change.
- ✦ Thermoelectric stability, drift characterization, and calibration studies
- Used in research for thermoelectric stability and drift characterization, multi-point temperature profiling, and as a reference Type K negative leg for calibration studies over the full measurement range.
Material Properties
| Element | Value |
|---|---|
| Maximum permeability | 1.07 |
| Element | Value |
|---|---|
| Elongation at break( % ) | <44 |
| Modulus of elasticity( GPa ) | 220 |
| Izod impact strength( J m⁻¹ ) | 108 |
| Tensile strength( MPa ) | 550-780 |
| Element | Value |
|---|---|
| Electrical resistivity( µOhmcm ) | 29-33 |
| Temperature coefficient( K⁻¹ ) | 0.0019 |
| Element | Value |
|---|---|
| Maximum use temperature in air( C ) | 1100 |
| Melting point( C ) | 1315-1390 |
| Specific heat( J K⁻¹ kg⁻¹ ) | 446@23°C |
| Thermal conductivity( W m⁻¹ K⁻¹ ) | 30-32@23°C |
| Coefficient of thermal expansion( x10⁻⁶ K⁻¹ ) | 16.8@20-1000°C |
| Element | Value |
|---|---|
| Density( gcm⁻³ ) | 8.5-8.7 |
Tolerances
| Conductor Diameter | ±10% | |
|---|---|---|
| Insulation Thickness | Nominal | |
| Length | +5% / -1% |